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Received this folding prop today and installed it on a D2826-10 1400kv Brushless HK Motor. At first, I thought I had received the wrong washers to install on each side of the prop blade hub. Turns out, you have to put a bit of pressure to get the second washer in - providing a tight fit. As mentioned on another post, there is only one small nut to hold the blade assembly - a bit scary! I added a lock washer, then a flat washer and then the nut. Thread lock liquid was applied liberally to the bolt to make sure this holds well. I also applied thread lock on the larger nut holding the hub to the motor shaft - better safe than sorry. I haven't tried the motor spinning but I'll post results of this later. I am a bit concerned that the blades are very tight and will not fold properly. Time will tell if this is a good alternative to the all plastic APC folding prop system.

looks ok for smaller motors but came with wrong screws so will have to drill out to make it work looks like there 3mm bore on the prop and the screw looks like maybe 2.5mm shaft, its less than 3mm
i was going to use on a ntm 1800kv 2836

This product is DANGEROUS ! the blade retention nuts have no thread locking or lock nut. The probability that a nut will vibrate loose and a ade gets thrown is too high for my comfort. I wont be using this prop. Another waste of money